Rep eplacement lacement & R & Reh ehabilita abilitation - PowerPoint PPT Presentation

Rep eplacement lacement & R & Reh ehabilita abilitation tion Progr gramme amme (R&R) R) of Wat ater er Ma Mains ins in in Ho Hong ng Kong ng 1

Water Supplies Department  To provide reliable and adequate supplies of quality water to a population of over 7.3 million.  17 impounding reservoirs  21 water treatment plants  5MCM fresh water production  2MCM sea water for flushing 2

Problem Identification  About 7,800 km of water mains (fresh water and salt water).  A substantial portion of them was laid more than 30 years ago.  Progressively approaching the end of their service life.  Increasing number of main burst and leakage cases causing inconvenience to the public and loss of precious water. 3

Project Goal  To improve the condition of the water supply network so as to maintain a reasonable level of services to consumers.  To replace or rehabilitate about 3,000 km of aged water mains in 15 years 4

Project Implementation - Key Issues  To avoid unnecessary water supply disruption to consumers as a result of excessive amount of works,  To avoid unnecessary traffic disruption during construction as a result of excessive road opening works, and  Having cost effectiveness of the works with priority given to water mains more susceptible to leakage and bursting.  To tackle the problems arising from the ageing of water mains in a cost effective manner whilst minimizing the effects on the general public , the aged water mains are required to replace and rehabilitate in Stages in a systematic manner. 5

Project Implementation - Key Issues  Traffic/Restricted working hours  Environmental concerns esp. in urban areas  Unforeseen site conditions / complicated interfaces with other utilities  Maintain water supply to suit different consumers and business undertakings 6

Project Implementation - Key Strategies 1) Replacement method Pipe Jacking Directional drilling Open Cut Method 7

Project Implementation - Key Strategies 2. Rehabilitation Method Fully Structural Non-Structural Linining by Compact Pipe Glass Fiber Coating Works 8

Benefits of the Project What's next... Water Intelligent Network (WIN) 9

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